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Commit d788bfa9 authored by Huacai Chen's avatar Huacai Chen Committed by Ralf Baechle
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MIPS: Loongson 3: Add IRQ init and dispatch support 



IRQ routing path of Loongson-3:
Devices(most) --> I8259 --> HT Controller --> IRQ Routing Table --> CPU
                                                  ^
                                                  |
Device(legacy devices such as UART) --> Bonito ---|

IRQ Routing Table route 32 INTs to CPU's INT0~INT3(IP2~IP5 of CP0), 32
INTs include 16 HT INTs(mostly), 4 PCI INTs, 1 LPC INT, etc. IP6 is used
for IPI and IP7 is used for internal MIPS timer. LOONGSON_INT_ROUTER_*
are IRQ Routing Table registers.

I8259 IRQs are 1:1 mapped to HT1 INTs. LOONGSON_HT1_* are configuration
registers of HT1 controller.

Signed-off-by: default avatarHuacai Chen <chenhc@lemote.com>
Signed-off-by: default avatarHongliang Tao <taohl@lemote.com>
Signed-off-by: default avatarHua Yan <yanh@lemote.com>
Tested-by: default avatarAlex Smith <alex.smith@imgtec.com>
Reviewed-by: default avatarAlex Smith <alex.smith@imgtec.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/6634


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent c7d3555a

arch/mips/include/asm/mach-loongson/irq.h

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#ifndef __ASM_MACH_LOONGSON_IRQ_H_

#define __ASM_MACH_LOONGSON_IRQ_H_



#include <boot_param.h>



#ifdef CONFIG_CPU_LOONGSON3



/* cpu core interrupt numbers */

#define MIPS_CPU_IRQ_BASE 56



#define LOONGSON_UART_IRQ   (MIPS_CPU_IRQ_BASE + 2) /* UART */

#define LOONGSON_HT1_IRQ    (MIPS_CPU_IRQ_BASE + 3) /* HT1 */

#define LOONGSON_TIMER_IRQ  (MIPS_CPU_IRQ_BASE + 7) /* CPU Timer */



#define LOONGSON_HT1_CFG_BASE		loongson_sysconf.ht_control_base

#define LOONGSON_HT1_INT_VECTOR_BASE	(LOONGSON_HT1_CFG_BASE + 0x80)

#define LOONGSON_HT1_INT_EN_BASE	(LOONGSON_HT1_CFG_BASE + 0xa0)

#define LOONGSON_HT1_INT_VECTOR(n)	\

		LOONGSON3_REG32(LOONGSON_HT1_INT_VECTOR_BASE, 4 * (n))

#define LOONGSON_HT1_INTN_EN(n)		\

		LOONGSON3_REG32(LOONGSON_HT1_INT_EN_BASE, 4 * (n))



#define LOONGSON_INT_ROUTER_OFFSET	0x1400

#define LOONGSON_INT_ROUTER_INTEN	\

	  LOONGSON3_REG32(LOONGSON3_REG_BASE, LOONGSON_INT_ROUTER_OFFSET + 0x24)

#define LOONGSON_INT_ROUTER_INTENSET	\

	  LOONGSON3_REG32(LOONGSON3_REG_BASE, LOONGSON_INT_ROUTER_OFFSET + 0x28)

#define LOONGSON_INT_ROUTER_INTENCLR	\

	  LOONGSON3_REG32(LOONGSON3_REG_BASE, LOONGSON_INT_ROUTER_OFFSET + 0x2c)

#define LOONGSON_INT_ROUTER_ENTRY(n)	\

	  LOONGSON3_REG8(LOONGSON3_REG_BASE, LOONGSON_INT_ROUTER_OFFSET + n)

#define LOONGSON_INT_ROUTER_LPC		LOONGSON_INT_ROUTER_ENTRY(0x0a)

#define LOONGSON_INT_ROUTER_HT1(n)	LOONGSON_INT_ROUTER_ENTRY(n + 0x18)



#define LOONGSON_INT_CORE0_INT0		0x11 /* route to int 0 of core 0 */

#define LOONGSON_INT_CORE0_INT1		0x21 /* route to int 1 of core 0 */



#endif



#include_next <irq.h>

#endif /* __ASM_MACH_LOONGSON_IRQ_H_ */

arch/mips/include/asm/mach-loongson/loongson.h

+10 −0
Original line number Diff line number Diff line
@@ -62,6 +62,12 @@ extern int mach_i8259_irq(void); 
#define LOONGSON_REG(x) \

	(*(volatile u32 *)((char *)CKSEG1ADDR(LOONGSON_REG_BASE) + (x)))



#define LOONGSON3_REG8(base, x) \

	(*(volatile u8 *)((char *)TO_UNCAC(base) + (x)))



#define LOONGSON3_REG32(base, x) \

	(*(volatile u32 *)((char *)TO_UNCAC(base) + (x)))



#define LOONGSON_IRQ_BASE	32

#define LOONGSON2_PERFCNT_IRQ	(MIPS_CPU_IRQ_BASE + 6) /* cpu perf counter */
@@ -87,6 +93,10 @@ static inline void do_perfcnt_IRQ(void) 
#define LOONGSON_REG_BASE	0x1fe00000

#define LOONGSON_REG_SIZE	0x00100000	/* 256Bytes + 256Bytes + ??? */

#define LOONGSON_REG_TOP	(LOONGSON_REG_BASE+LOONGSON_REG_SIZE-1)

/* Loongson-3 specific registers */

#define LOONGSON3_REG_BASE	0x3ff00000

#define LOONGSON3_REG_SIZE	0x00100000	/* 256Bytes + 256Bytes + ??? */

#define LOONGSON3_REG_TOP	(LOONGSON3_REG_BASE+LOONGSON3_REG_SIZE-1)



#define LOONGSON_LIO1_BASE	0x1ff00000

#define LOONGSON_LIO1_SIZE	0x00100000	/* 1M */

arch/mips/loongson/Makefile

+6 −0
Original line number Diff line number Diff line
@@ -15,3 +15,9 @@ obj-$(CONFIG_LEMOTE_FULOONG2E) += fuloong-2e/ 
#



obj-$(CONFIG_LEMOTE_MACH2F)  += lemote-2f/



#

# All Loongson-3 family machines

#



obj-$(CONFIG_CPU_LOONGSON3)  += loongson-3/

arch/mips/loongson/loongson-3/Makefile

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#

# Makefile for Loongson-3 family machines

#

obj-y			+= irq.o

arch/mips/loongson/loongson-3/irq.c

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#include <loongson.h>

#include <irq.h>

#include <linux/interrupt.h>

#include <linux/module.h>



#include <asm/irq_cpu.h>

#include <asm/i8259.h>

#include <asm/mipsregs.h>



unsigned int ht_irq[] = {1, 3, 4, 5, 6, 7, 8, 12, 14, 15};



static void ht_irqdispatch(void)

{

	unsigned int i, irq;



	irq = LOONGSON_HT1_INT_VECTOR(0);

	LOONGSON_HT1_INT_VECTOR(0) = irq; /* Acknowledge the IRQs */



	for (i = 0; i < ARRAY_SIZE(ht_irq); i++) {

		if (irq & (0x1 << ht_irq[i]))

			do_IRQ(ht_irq[i]);

	}

}



void mach_irq_dispatch(unsigned int pending)

{

	if (pending & CAUSEF_IP7)

		do_IRQ(LOONGSON_TIMER_IRQ);

	else if (pending & CAUSEF_IP3)

		ht_irqdispatch();

	else if (pending & CAUSEF_IP2)

		do_IRQ(LOONGSON_UART_IRQ);

	else {

		pr_err("%s : spurious interrupt\n", __func__);

		spurious_interrupt();

	}

}



static struct irqaction cascade_irqaction = {

	.handler = no_action,

	.name = "cascade",

};



static inline void mask_loongson_irq(struct irq_data *d)

{

	clear_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE));

	irq_disable_hazard();

}



static inline void unmask_loongson_irq(struct irq_data *d)

{

	set_c0_status(0x100 << (d->irq - MIPS_CPU_IRQ_BASE));

	irq_enable_hazard();

}



 /* For MIPS IRQs which shared by all cores */

static struct irq_chip loongson_irq_chip = {

	.name		= "Loongson",

	.irq_ack	= mask_loongson_irq,

	.irq_mask	= mask_loongson_irq,

	.irq_mask_ack	= mask_loongson_irq,

	.irq_unmask	= unmask_loongson_irq,

	.irq_eoi	= unmask_loongson_irq,

};



void irq_router_init(void)

{

	int i;



	/* route LPC int to cpu core0 int 0 */

	LOONGSON_INT_ROUTER_LPC = LOONGSON_INT_CORE0_INT0;

	/* route HT1 int0 ~ int7 to cpu core0 INT1*/

	for (i = 0; i < 8; i++)

		LOONGSON_INT_ROUTER_HT1(i) = LOONGSON_INT_CORE0_INT1;

	/* enable HT1 interrupt */

	LOONGSON_HT1_INTN_EN(0) = 0xffffffff;

	/* enable router interrupt intenset */

	LOONGSON_INT_ROUTER_INTENSET =

		LOONGSON_INT_ROUTER_INTEN | (0xffff << 16) | 0x1 << 10;

}



void __init mach_init_irq(void)

{

	clear_c0_status(ST0_IM | ST0_BEV);



	irq_router_init();

	mips_cpu_irq_init();

	init_i8259_irqs();

	irq_set_chip_and_handler(LOONGSON_UART_IRQ,

			&loongson_irq_chip, handle_level_irq);



	/* setup HT1 irq */

	setup_irq(LOONGSON_HT1_IRQ, &cascade_irqaction);



	set_c0_status(STATUSF_IP2 | STATUSF_IP6);

}